Most movie cameos are easy to spot – indeed, a lot of the time, noticing these brief appearances by big names in the industry is entirely the point! But sometimes, these “mega star, minor moment” instances can fly completely under the radar.

When this happens, it’s almost always on purpose. The typical rationale for sneaking a recognizable face into a film is that the filmmakers want to do a favor for one of their high profile friends – and c’mon, who doesn’t want to be in a flick like Star Wars? – without distracting the audience.

Other times, it’s a case of those involved looking to have a bit of good-natured fun and hoodwinking the audience by hiding a major celebrity in plain sight.

Whatever the reason, spotting these often ultra-brief walk-ons by some of the biggest names in the entertainment world can be a surprisingly rewarding feeling – consider it the movie geek version of bird watching.

It also means that you’ll likely never watch certain scenes in quite the same way, knowing that guy or gal you thought was only an extra is actually a Hollywood A-lister in disguise.

So in order to totally rock your world – or at the very least, encourage you to revisit a lot of great films – we’ve compiled this list of 20 Movie Cameos You Completely Missed. Happy hunting!